I have six chickens on this area of the farm that were my first chickens. They are a little over 3 years old. They have free range over several acres. One of them, my Ameraucana is not looking so hot. At first, I thought she was just molting. She has looked like this for a long time now. The other chickens are not pecking on her. It looks like her feathers have lost their barbs. She's really soft and fluffy. I'm putting in a pic of my other Ameraucana and then a black sex link. Their feathers are fine. If it is mites, wouldn't my other hens have it too? What can I do for her? Thanks